The factors affecting the uncertainty of determination of petroleum content in soil by infrared spectro-photometry were analyzed in this study.And the uncertainty components were also assessed.The value of synthesis rel-ative uncertainty was 0.036,and the relative combined uncertainty caused by the digestion of the test fluid concentra-tion was 0.033;the largest component of uncertainty was produced by fitting the standard curve and the value was 0.029.The measurement result was X=57.3±4.12mg/kg,(k=2)(95%confidence level).
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